Im using the following configuration to handle sessions # Session database, used for checking Simultaneous-Use. Either the radutmp # or rlm_sql module can handle this. # The rlm_sql module is *much* faster session { #radutmp # # See "Simultaneous Use Checking Querie" in sql.conf sql } My problem is that im getting Access-Reject packet every now and then (My users are logging in and out correctly... and my NASes are all up and functioning) According to this thread http://lists.freeradius.org/mailman/htdig/freeradius-users/2005-March/042339... - radutmp must be enabled I have noticed that you cant rely on the sql method, even thou there is a simul_count_query! In my case when i encounter a stale session i set the AcctStopTime = AcctStartTime + AcctSessionTime. Although this seems to work most of the time, its not fool proof as can be seen in this case study: http://lists.freeradius.org/mailman/htdig/freeradius-users/2006-June/054073.... My question is why cant you rely on only the sql method? And what is the correct method to clean stale session when using the sql session handling?